In the human body which system functions in detecting and responding to stimuli?
a. endocrine
b. circulatory
c. muscular
d. nervous

During the winter, this species of fox has white fur, but in the summer, it has brown fur. what environmental change may have lead to this fox's fur color? snow cover increase in sun's brightness volcanic eruption global warming

Rarefaction is used for which of the following? a. creating a representative sample b. studying how disease impacts populations c. rediscovering species thought to be instinct d. determining which sea creatures live in an area

Has magnification ability of hundreds of thousands of times